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Centralized DBMS:
• Combines everything into single
system including- DBMS software, hardware, application programs, and user
interface processing software.
• User can still connect through
a remote terminal – however, all processing is done at centralized site.
A Physical Centralized Architecture
Architectures for DBMS have
followed trends similar to those generating computer system architectures.
Earlier architectures used mainframes computers to provide the main processing
for all system functions, including user application programs and user interface
programs as well all DBMS functionality. The reason was that most users accessed
such systems via computer terminals that did not have processing power and only
provided display capabilities. Therefore all processing was performed remotely
on the computer system, and only display information and controls were sent
from the computer to the display terminals, which were connected to central
computer via various types of communication networks.
As prices of hardware declined,
most users replaced their terminals with PCs and workstations. At first
database systems used these computers similarly to how they have used is play
terminals, so that DBMS itself was still a Centralized DBMS in which all the DBMS
functionality, application program execution and user interface processing were
carried out on one Machine.
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